A fault, also known as a disjunctive dislocation,
is a break in the continuity of a geological formation. Faults can be formed
when the earth's crust is compressed or stretched. They vary greatly in size,
both in length and depth. Faults are classified according to the type and
direction of movement of the rocks on either side of the fault. For example, a
fault along which no appreciable movement has occurred is called a joint.
Faults with appreciable movement include vertical faults, thrust faults,
transcurrent faults, and displacements.

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